How is even that possible ? If you're sending funds from your wallet,it should reflect the same address .
1.Make sure you are not using multiple address in your wallet.The initial wallet will be different but in case if you would have received the payments in another wallet,the same should be reflected while sending.
2.You sure you aren't using any coin mixing services ?
3.Post the deposit wallet and the money you sent from wallet addresses.That should make things easier to understand.
4.The new wallet is in Beta stages,its not advisable to use it too soon!
Indeed in fact its not possible standard, I can guarantee this to you without any doubts, maybe you have multiple wallet on the blockchain or indeed there is use a coinmixing machine, is there also no possibility that the website is using a sort of mixing system ??